This book retraces the history of the Swiss watch maison, documenting events and practically the entire production of more than 140 years. Setting out from the first pocket-watches, which after the 30's gradually gave way to the more modern wrist contraptions accessories initially seen in a very negative light, the book documents the invention of both the revolutionary 17 ligne movement and one of the sector's best known calibres : the legendary El Primero.With more than 700 illustrations with detailed captions, Zenith also includes the increasingly specialised models: waterproof casings, chronometers, chronographs with special dials and timepieces for the military, sport and medical sectors. Not to mention anecdotes, memorabilia and rare period advertisements.